Centene officer plans $3.8M stock sale under Rule 144

CENTENE CORP (CNC) received a Rule 144 notice covering a proposed sale of up to 56,500 shares of its common stock for the account of officer Christopher A. Koster, through Fidelity Brokerage Services LLC.

Rhea-AI Filing Summary

CENTENE CORP (CNC) received a Rule 144 notice covering a proposed sale of up to 56,500 shares of its common stock for the account of officer Christopher A. Koster, through Fidelity Brokerage Services LLC. The stated aggregate market value of the shares covered is $3,779,852.00 as of August 26, 2026, with 493,995,000 shares of common stock outstanding.

The shares derive from multiple acquisitions between 2020 and 2025, including employee stock purchase plan (ESPP) purchases and restricted stock vesting awards. The filing also reports that Koster sold 47,603 shares of Centene common stock on August 18, 2026 for $3,111,262.14.

Key Figures

Shares to be sold under Rule 144: 56,500 shares Aggregate market value of shares to be sold: $3,779,852.00 Shares outstanding: 493,995,000 shares +4 more

7 metrics

Shares to be sold under Rule 144 56,500 shares Common stock covered by the notice through Fidelity Brokerage Services LLC

Aggregate market value of shares to be sold $3,779,852.00 Value of 56,500 Centene common shares covered by the notice

Shares outstanding 493,995,000 shares Centene common stock outstanding as stated in the filing

Shares sold in past 3 months 47,603 shares Centene common shares sold by Christopher A. Koster on August 18, 2026

Proceeds from recent sale $3,111,262.14 Total consideration for 47,603 shares sold on August 18, 2026

Restricted Stock Vesting on 04/27/2021 13,812 shares Centene common stock acquired by compensation vesting

Restricted Stock Vesting on 12/15/2023 6,146 shares Centene common stock acquired by compensation vesting

Key Terms

Rule 144, Employee Stock Purchase Plan, Restricted Stock Vesting, attorney-in-fact, +1 more

5 terms

Rule 144 regulatory

"See the definition of "person" in paragraph (a) of Rule 144."

Rule 144 is a U.S. securities regulation that sets conditions under which restricted or insider-held shares can be legally resold to the public, such as required holding periods, availability of public information, limits on how much can be sold at once, and certain filing requirements. For investors it matters because it determines when previously locked-up shares can enter the market — like a release valve that can increase supply, affect share price, and signal insider intent.

Employee Stock Purchase Plan financial

"ESPP Purchase | Issuer | | | 41 | 06/30/2020 | Cash"

An employee stock purchase plan is a company program that lets workers buy shares through small payroll deductions, often at a discount to the market price and after a set offering period. Think of it like a workplace savings plan that turns into ownership: it encourages employees to share in the company’s success and can create predictable buying or selling of stock that investors watch because it affects supply, demand and employee incentives.

Restricted Stock Vesting financial

"Restricted Stock Vesting | Issuer | | | 13812 | 04/27/2021"

Restricted stock vesting is the timetable and conditions under which shares granted to employees or insiders become fully owned and can be sold, typically requiring continued work or meeting performance goals. It matters to investors because large blocks of shares can become tradable at once, which can change share supply and price, and because vesting aligns insiders’ incentives with the company’s long‑term performance—think of it like a timed unlock that both rewards and locks in key people.

attorney-in-fact regulatory

"as attorney-in-fact for Christopher A. Koster"

An attorney-in-fact is the person or entity given legal authority through a power of attorney to act on behalf of another for specific tasks, such as signing documents, voting shares, or handling transactions. For investors, this matters because it lets a trusted representative make timely decisions or complete paperwork when the owner cannot, much like handing keys to someone to run errands on your behalf—so checks on scope and limits of that authority are important.

aggregate market value financial

"Common | Fidelity Brokerage Services LLC ... | 56500 | 3779852.00"

Aggregate market value is the combined price you would pay to buy all outstanding shares of a company or all companies in a group at current market prices — essentially the sum of each stock’s market capitalization. It matters to investors because it shows the overall size and weight of an investment or sector (like the total cost to buy every piece of a puzzle), helps compare scale across companies or markets, and influences index composition and risk exposure.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What does Centene Corp (CNC) disclose in this Form 144 filing?

The filing reports a planned resale under Rule 144 of up to 56,500 CNC common shares for officer Christopher A. Koster, with an aggregate market value of $3,779,852.00, through Fidelity Brokerage Services LLC.

How many Centene (CNC) shares is Christopher A. Koster planning to sell?

The notice covers a proposed sale of up to 56,500 shares of Centene common stock. This amount is based on information provided for a planned Rule 144 transaction through Fidelity Brokerage Services LLC.

What is the aggregate market value of the Centene (CNC) shares covered by this Form 144?

The shares covered by the notice have an aggregate market value of $3,779,852.00. This figure relates to the 56,500 shares of Centene common stock referenced in the planned Rule 144 sale.

How many Centene (CNC) shares are outstanding as stated in the filing?

The filing states that Centene has 493,995,000 shares of common stock outstanding. This is provided as context alongside the proposed Rule 144 sale amount covered by the notice.

What Centene (CNC) stock transactions has Christopher A. Koster made in the past three months?

The filing reports that on August 18, 2026, Christopher A. Koster sold 47,603 shares of Centene common stock for total consideration of $3,111,262.14.

How were the Centene (CNC) shares acquired that are now being sold under Rule 144?

The shares were acquired through multiple transactions, including Employee Stock Purchase Plan (ESPP) purchases and restricted stock vesting awards between 2020 and 2025, as listed in the acquisition history in the filing.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 08/26/2026 - 01:45 PM EDT Accepted by SEC EDGAR 08/26/2026 - 01:45 PM EDT Learn about SEC filing dates

Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK	0001802501
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	CENTENE CORP
SEC File Number	001-31826
Address of Issuer	7700 FORSYTH BLVD. ST LOUIS MISSOURI 63105
Phone	3147254477
Name of Person for Whose Account the Securities are To Be Sold	KOSTER CHRISTOPHER
See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.
Relationship to Issuer	Officer

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Common	Fidelity Brokerage Services LLC 900 Salem Street Smithfield RI 02917	56500	3779852.00	493995000	08/26/2026	NYSE

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Common	06/30/2020	ESPP Purchase	Issuer			41	06/30/2020	Cash
Common	12/10/2020	Restricted Stock Vesting	Issuer			1657	12/10/2020	Compensation
Common	12/11/2020	Restricted Stock Vesting	Issuer			1472	12/11/2020	Compensation
Common	12/12/2020	Restricted Stock Vesting	Issuer			1311	12/12/2020	Compensation
Common	12/15/2020	Restricted Stock Vesting	Issuer			9075	12/15/2020	Compensation
Common	03/31/2021	ESPP Purchase	Issuer			41	03/31/2021	Cash
Common	04/27/2021	Restricted Stock Vesting	Issuer			13812	04/27/2021	Compensation
Common	06/30/2021	ESPP Purchase	Issuer			36	06/30/2021	Cash
Common	09/30/2021	ESPP Purchase	Issuer			42	09/30/2021	Cash
Common	12/10/2021	Restricted Stock Vesting	Issuer			1657	12/10/2021	Compensation
Common	12/11/2021	Restricted Stock Vesting	Issuer			1474	12/11/2021	Compensation
Common	12/31/2021	ESPP Purchase	Issuer			32	12/31/2021	Cash
Common	03/31/2022	ESPP Purchase	Issuer			31	03/31/2022	Cash
Common	06/30/2022	ESPP Purchase	Issuer			31	06/30/2022	Cash
Common	09/30/2022	ESPP Purchase	Issuer			34	09/30/2022	Cash
Common	12/30/2022	ESPP Purchase	Issuer			32	12/30/2022	Cash
Common	03/31/2023	ESPP Purchase	Issuer			42	03/31/2023	Cash
Common	06/23/2023	Restricted Stock Vesting	Issuer			2506	06/23/2023	Compensation
Common	06/30/2023	ESPP Purchase	Issuer			39	06/30/2023	Cash
Common	09/29/2023	ESPP Purchase	Issuer			38	09/29/2023	Cash
Common	12/15/2023	Restricted Stock Vesting	Issuer			6146	12/15/2023	Compensation
Common	12/29/2023	ESPP Purchase	Issuer			36	12/29/2023	Cash
Common	03/15/2024	Restricted Stock Vesting	Issuer			2700	03/15/2024	Compensation
Common	03/28/2024	ESPP Purchase	Issuer			34	03/28/2024	Cash
Common	06/23/2024	Restricted Stock Vesting	Issuer			2513	06/23/2024	Compensation
Common	06/28/2024	ESPP Purchase	Issuer			40	06/28/2024	Cash
Common	09/30/2024	ESPP Purchase	Issuer			35	09/30/2024	Cash
Common	12/15/2024	Restricted Stock Vesting	Issuer			3184	12/15/2024	Compensation
Common	02/04/2025	Restricted Stock Vesting	Issuer			4730	02/04/2025	Compensation
Common	03/15/2025	Restricted Stock Vesting	Issuer			3679	03/15/2025	Compensation

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
Christopher A. Koster 7700 Forsyth Boulevard St. Louis MO 63105	Common	08/18/2026	47603	3111262.14

144: Remarks and Signature

Remarks
Date of Notice	08/26/2026
ATTENTION:
The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.
Signature	/s/ Gary Redman, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Christopher A. Koster
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)